Lemon Blueberry Muffins

I like the flavors of lemon and blueberry together. I recently had some blueberries in the fridge I need to use so I found a recipe to make muffins- It's pretty good. I haven't decided if its my favorite or not yet.  The original recipe I found as this website: http://thecafesucrefarine.com/2014/04/bakery-style-blueberry-lemon-muffins/  I'm re-posting it here with changes I made to it.

CRUMB TOPPING
5 tablespoons butter
½ cup sugar
½ cup flour
½ cup oatmeal

MUFFINS
2 cups all purpose flour
1 ½ teaspoons baking powder
½ teaspoon salt
½ cup butter, softened
1 cup sugar
2 large eggs
½ cup buttermilk- I don't ever have buttermilk- so I used 1-2 tsp lemon juice in milk (enough to make the ½ cup) and let it curdle - it works the same.
finely grated zest of 1 lemon
1 teaspoon vanilla
2 cups fresh blueberries

The original recipe has a glaze - 3 Tbsp lemon juice and 1 cup powdered sugar - I made it, but it was WAY too runny. So I don't think I'll use that again.It didn't drizzle nicely on the muffins- it was more like pouring water on them.

DIRECTIONS

1. Preheat oven to 350˚F. Line a 12-cup muffin pan with paper liners. (I needed 16- the original recipe must have bigger muffin tins)
2. Make the crumb topping by combining the melted butter, sugar, flour, oatmeal and salt. Stir with a fork until crumbs form. Set aside.
3. Beat butter for 1 minute until soft and fluffy. Add sugar and continue to beat for 3 minutes. Add eggs, one at a time and beat just until incorporated. Add milk, vanilla and lemon zest and mix on low until combined.
4. Add the baking powder and salt.
5. Add flour mixture and stir, by hand, until flour disappears. Do not over mix or muffins will be tough. Gently stir in blueberries.
6. Divide mixture evenly in the prepared muffin pan. Sprinkle with the crumb topping.
7. Bake at 350˚F for 22 to 25 minutes or until light golden and a toothpick inserted into the center comes out clean. Allow muffins to cool for 5 minutes in the pan before removing to a wire rack. (drizzle with the glaze if you made it)